Contact Cancellation

Bought a car on 21/08/2015, ever since I bought the car it's been giving me problems. The engine and battery light was always on, the fog light is not working and the airbag light is always on too. Took the car in to AA they found it Unroadworthy, took it to the manufacturer dearler found the car unreadworth and also took it to an RMI member from first glance they saw problems on the car. Now the dealer is taking me from pillar to post because I wanted to cancel the contract.